Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f07ad412b09c9ed…

MALICIOUS

PDF

125.0 KB Created: 2021-06-19 05:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 299e7ba93d113ab6a07526f4067675e2 SHA-1: 45f31a6a878a074329030757d3ca7eb74133d9f4 SHA-256: 3f07ad412b09c9ed18db6215346ba4c71783cabbfb5e5bbc7a3e5ecb3e4af2c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute phishing content or malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=how+to+use+spirits+in+smash+bros+ultimate PDF link annotation
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f37e58fab---21531902440.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mueqa8p3c8qn8pmdol7de96bd6/72199948105.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160cc79bb48359---nojovexikajuraf.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/95d74f43e6e867c2c101e26930ce51f2/80940720140.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ea0c4d99c58e98711a38b9fb1cf3bcfc/xovajezajemufebajanuwim.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b770d11812f---76633626266.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9346116c20---89033121276.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfbc01e194---vevaxumukavosaxa.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/f12267d9c874f8d36eebe41e2ba7c498/98537119545.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/245e731b3e3e01520134484b2472947a/34069690002.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c00f0fd91a3---43522475655.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57f7b03092---55223367491.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1a349eb01---21427040464.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc08d3b6c46---10148347097.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/giwegeniba.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/lakaredoworobowez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000175be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175BE 10920 bytes
SHA-256: ec2be68fba18fff2577eb9ec7a1993b740bca98da376cc601acd4c57c03ce594
font_01_sfnt_off00019992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19992 5252 bytes
SHA-256: ac3f1a2e9a61809f6bc9987c25416df45fb45f69b69e7ed42d541d3dbc0518a2
font_02_sfnt_off0001ab41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB41 4892 bytes
SHA-256: 97cbd3405db98ce33fdc0047d13104f0eee2f46bc8fb9cbd0061c745d334a1d0
font_03_sfnt_off0001bcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCEE 12384 bytes
SHA-256: c6aff521bd141624bcde994205ac8ebfdca499d656f3fb291c33015b2fd3da99

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